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<script>
    //     题目4: 写一个函数 parseQueryString，它的用途是把 URL 参数解析为一个对象
    // 函数名：parseQueryString
    // 参数：URL字符串
    // 返回值：URL字符串解析后的对象
    // 例如：parseQueryString("admin=user&pass=1234") 返回 {admin:"user",pass:"1234"}
    function parseQueryString(url) {
        let json = {};
        let arr = url.split("&");
        let str = arr.join(",");
        arr = str.split("=");
        str = arr.join(",");
        arr = str.split(",");


        for (let i = 0; i < arr.length; i++) {

            if (i % 2 == 0) {
                let x = arr[i];
                let y = arr[i + 1];
                json[x] = y;
            }

        }
        return json;
    }
    let flag = parseQueryString("admin=user&pass=1234");
    console.log(flag);
</script>